Automatically-threading loom shuttle



Patented Dec. 16, 1930 UNrreloy STATES PATENT oFFlCEg CARL n. BROWN, or HQPEDALE, MASSACHUSETTS, VASSIGNOR To DBAPER celeron-A- TroN, or HoPnD-ALE, MASSACHUSETTS, A ooRPonATroN or ,1x/.mitmk AUTOMATICALLY-JIHREADING LOM SHUTTLE Application led may 2, 1930. Serial No. 449,178. v

This invention relates to automatically threading loom shuttles wherein the filling in the shuttle is changed from time to time.

It is now the general ,practice to provide some character .of thread tensioning means in the shuttle in Van attempt to maintain the thread under tension during weaving, but in order that perfect cloth may be woven the tension exerted on the thread should be the same on the rst pick of the shuttle followis usually the case, thelack` of uniform ten- Sion will be manifested in the finished cloth. This is particularly true in weaving with certain kinds of filling such, for inst-ance, as silk, artificial silk7 rayon and the like.

Among the attempts that have heretofore been made to Secure uniform tension on the thread throughout the weaving operation, the incoming filling thread has been wrapped or turned about a rigid arm extending longitudinally of the Shuttle and reliance is placed upon the frictional engagement of the thread with the arm to secure the desired tension. During the weaving operation, however, the thread will at times exert a pull from the shuttle and at other times will become Slack, so that the rigid arm heretofore employed will not function to take up the slack, even though it may function in a degree, at least, in retarding the thread withdrawal from the shuttle.

@ne of the objects of the present invention is to provide an automatically threading loom Shuttle with a yielding tensioning member extending longitudinally of the shuttle and about which the thread is passed or wrapped on the first pick of the shuttle following replenishment, the resultbeing that while the tensioning member exerts a degree of frictional retardation to the withdrawal of the thread during weaving, it will also yield to the pull of the thread, so that when the thread becomes slack the yielding action of the tensioning member serves to take up the slack that may occur and thereby maintain equal and uniform tension on the thread during the entire weaving operation.

.In carrying the invention into effect for the purpose above indicated, the resilient tensioning member extends longitudinally of the shuttle and about it the' thread is passed or wrapped` onthe firstpick of the shuttle following replenishment so that the tensioning member may act additionally to the frictional retardation of thethread to yield under the thread pull and then by reason of its resiliencytake 'up any Slack that may occur during the weaving operation. Y

The invention and novelffeatures thereof will best be made clear from the following description and the` accompanying drawings of one good form thereof.

In the drawings:

Fig. l is a plan view of an automatically threading shuttle containing the present invention, some of the parts being broken away;

Fig. 2 is a detached detail in side elevation showing a threading block with the tensioning device of the present invention applied thereto;

Fig. 3 is a sectional perspective view of a threading bloclrwiththev tensioning device of the present invention applied thereto and showing the course of the thread when the shuttle is fully threaded; and

Figsit and 5 are views similar to that of Fig. 3 showing Slightly modified forms of the invention. y

The shuttle 1 may be of the usual automatically threading type having the bobbin chamber 2 for containing the supply of filling thread 3,V and frontward of the bobbin chamber the shuttle is provided with a longitudinal thread passage 4 rand a side delivery eye 5 which communicates therewith that the shuttle may be automatically threaded during the loom operation'. Y V

It is now the common practice to provide automatically threading loom shuttles with a threading device or block to insure that on the first pick of the shuttle following replenishment the thread will passdownwardly into the longitudinal thread passage, and on the return pick of the shuttle it will be fully threaded and the thread will thereafter be delivered from the side delivery eye. The threading block, when used, may be of any of the usual types, and, as shown in the present instance of the invention, the threading block 6 is provided with a longitudinal thread passage 7 which extends from the bobbin chamber forwardly towards the side delivery eye. As shown in the present instance, the longitudinal thread passage 7 is provided between the side walls 8 and 9 of the threading block and the latter may be secured in operative position by the usual transverse securing bolt which passes through an opening 10 in the threading block, as is customary.

The threading block 6 has a forwardly eX- tending portion or thread director 11 and between the forward edge and the wood of the shuttle at 12 is a thread passage for directing the thread on the second pick of the shuttle to the side delivery eye.

On the rst pick of the shuttle following replenishment, the thread a will pass downwardly into the longitudinal thread passage and on the ret-urn pick of the shuttle it will pass through the thread passage leading to the side delivery eye, whereupon the shuttle becomes fully threaded.

In accordance with the present invention, a resilient thread tensioning member extends longitudinally of the thread passage and a thread deflector or guide is provided for causing the thread to be laid about the resilient tensioning` member on the first pick of the shuttle following replenishment.

In the present instance, the thread tension ing member consists of an elongated resilient arm 13 which has its forward end secured to the shuttle. Various means may be devised for securing the end of the resilient thread tensioning member to the shuttle or threading block, but in the present instance, the member 13 is turned outwardly at 14 and enters an opening 15 in the side wall of the threading block opposite the side thereof adjacent to the delivery eye.

The thread tensioning member'l therefore extends from the forward portion of the longitudinal thread passage towards the bobbin chamber where it is bent or looped, as at 16, and formed in a spiral 17 the coils of which enclose the thread tensioning member 18 and extend longitudinally towards the forward end of the thread passage, as more clearly indicated in Fig. 3. Obviously, there may be any number of coils formed in the spiral, and from the terminal coil thereof the leg portion 18 extends forwardly and is downturned at 19 below the lower wall of the thread passage and may then be turned rearwardly, as at 20, and secured in position by am7 suit-able means, such as the screw 21.

The con-struction described for securing the leg portion 18 of the spiral in place may be variously modified, the essential being that both the leg portion 18 of the spiral and 13 of the resilient tensioning member be secured at a point remote from the bobbin chamber from which the two leg portions extend rearwardly towards the bobbin chamber, as indicated, the loop portion 16 connecting the leg portions of the spiral and resilient tensioning member being free.

From the construction described as one good form of the invention it will be noted that when replenishment of lling has been effected, the thread a will pass downwardly into the longitudinal thread passage, and when the shuttle is picked the swirling thread as it is withdrawn from the bobbin inthe bobbin chamber will engage the spirals of the coil and be directed about the resilient thread tensioning member a number of times, thereby imparting to the thread the desired tension, and when the shuttle is picked towards the replenishing side of the loom and the thread leads from the side delivery eye, the resilient action of the thread tensioning member will cause it to yield laterally under the thread pull and upon the occurrence of any slack in the thread, the thread tensioning member will return to its original position, thereby taking up slack.

In the construction thus far described it will be seen that when the shuttle is fully 3.

threaded, the thread a will lead .laterally from the resilient member 13 towards the side delivery eye and will be supported by the resilient tensioning member 18 in its proper position, the result being that should a lateral pull be exerted on the thread tensioning member 13 during weaving, there will be a yield of the tensioning` member laterally and on the occurrence of slack the resilient tensioning member will act yieldingly upon the thread to take up slack.

In the modification shown by F ig. ff, the resilient thread tensioning member is provided with a number of bends 22 in the loops of which the threads a will rest during weaving.

The spiral in Fig. 4; is substantially of the same general character as that already described, comprising the loop portion 16 and the spiral or spirals 17, and from the terminal portion of the spiral, as at 23, the leg portion of the spiral is carried forwardly and Secured to the shuttle at a point remote from the bobbin chamber. In the modified form of the inventionT as described, it will also be noted that the thread a will be supported by the leg 24 of the spiral as the thread passes to the side deliveryv eye.

Thus in both forms of the invention, the thread is under control of a resilient thread tensioning member about which the thread is wrapped in the longitudinal thread passage, and upon the occurrence of a pull upon the thread, the resilient thread tensioning member will yield and then act to take up slack, with the result that throughout the y weaving` operation the thread will be subjected to uniform tension.

In the modified form of the invention shown by Fig. 5 the leg portion of the resilient tensioning member 25 and the leg portion of the spiral or thread deflector 26 are carried forward beneath a pinor porcelain guide 27 that extends transversely of the thread passageabove the ,bottom wall thereof, and the legs are turned downward and secured to the bottom of the threading block by a screw or other clamp 28. In this form of the device the thread will pass about the tensioning member 25 as in the other forms and will lead from the forward end of the tensioning member upwardly and over the guide 27 to the side delivery eye.

What is claimed is l. An automatically threading loom shuttle having a bobbin chamber, a longitudinal thread passage and a side delivery eye communicating therewith that the shuttle may be automatically threaded as the shuttle is picked, a thread tensioning member extending longitudinally of the thread passage and resiliently responsive to the pull of the thread to maintain tension thereon and take up slack during weaving, and a thread ldirecting spiral the coils of which surround the tensioning member for progressively directing the thread about the resilient tensioning member as the shuttle is picked.

2. An automatically threading loom shuttle having a bobbin chamber, a longitudinal thread passage and a side delivery eye communicating therewith that the shuttle may be automatically threaded as the shuttle is picked, a resilient thread tensioning member extending longitudinally of the thread passage and resiliently responsive to the pull of the thread during weaving to maintain tension thereon and take up slack, and a thread directing spiral the coils of which extend longitudinally of -the thread passage and surround the tensioning member for progressively directing the thread about the resilient tensioning member as the shuttle is picked.

3. An automatically threading loom shuttle having a bobbin chamber, a longitudinal thread passage and a side delivery eye communicating therewith, a thread tensioning member extending longitudinally of the thread passage and resiliently responsive to the pull of the thread as it is withdrawn from the shuttle to maintain tension on the thread and take up slack, and a thread director constituted as a spiral extending longitudinally of the thread passage about the resilient tensioning member for progressively wrapping the thread about the tensioning member as the shuttle is picked following replenishment of filling.

4. An automatically threading loom shuttle having a bobbin chamber, a longitudinal thread passage and a side delivery eye communicating therewith, a thread tensioning member consisting of a yielding arm extending longitudinally of the thread passage and i 5. An automatically threading loom shuti tle having a bobbin chamber, a longitudinal Athread passageand a side delivery eye communicating therewith, a thread tensioning member constituted as an arm extending longitudinally of the thread passage and resiliently responsive tothe pull of the thread during weaving to maintain tension thereon and take up slack, and a thread director carried by the resilient arm and extending longitudinally of the thread passage aboutthe resilient armto lay the thread progressively about the arm as the shuttle is picked following replenishment of filling.

6. An automatically threading loom shutf tle having la bobbin chamber, a longitudinal thread passage and a side delivery eye communicating therewith that the shuttle may be automatically threaded, a thread tensioning member formed Vas a spring arm extending longitudinally of the thread passage with its end remote from the bobbin chamber se.- cured to the shuttle and the free portion adj acent the bobbin chamber formed into a spiral, the coils of `which extend about the spring arm longitudinally of the bobbin chamber, with its terminal portion secured to the shuttle remote from the bobbin chamber.

7. A n automatically threading loom shuttle having a bobbin chamber, a. longitudinal f thread passage and a side delivery eye communicating therewith, a thread tensioning device constituted as length of resilient wire having both ends thereof secured to the shuttle adjacent the forward end of the ithread passage and two leg portions extending longitudinally of the thread passage towards the bobbin chamber, one of said leg portions constituting a thread tensioning member and the other formed with bends l" S. An automatically threading loom shuttle having a bobbin chamber, a longitudinal thread passage and a side delivery eye communicating therewith that the shuttle may be automatically threaded as the shuttle is picked, a thread tensioning member constif tuted as a spring arm extending longitudinally of the thread passage and yieldingly responsive to the pull of the thread during Weaving to maintain a yielding tension on 5 the thread and take up slack, and a thread directing spiral the coils of which extend longitudinally of the thread passage and surround the tensioning member for progressively directing the thread about the tensioning member as the shuttle is picked.

9. An automatically threading loom shuttle having a bobbin chamber, a longitudinal thread passage and av side delivery eye communicating therewith that the shuttle may be automatically threaded as the shuttle is picked, a thread tensioning member constituted as a yielding arm extending longitudinally of the thread passage and having its end remote from the bobbin chamber secured to the shuttle that the yarn may yield to the pull of the thread during weaving to maintain a yielding tension on the thread and take up slack, and a thread directing spiral the coils of which surround the tensioning member for progressively directing the thread about the tensioning member as the shuttle is picked.

10. An automatically threading loom shuttle having a bobbin chamber, a longitudinal thread passage and a side delivery eye communicating therewith, a thread tensioning device constituted as a. length of wire having both ends thereof secured to the shuttle adjacent the forward end of the thread passage and two leg portions extending longitudinally of the thread passage towards the bobbin chamber, one of said leg portions constituting a thread tensioning member and the other formed with bends extending around the tensioning member in the longitudinal thread passage for directing the thread about the tensioning member as the shuttle is picked.

In testimony whereof, I have signed my name to this specification.

CARL D. BROVN. 

